https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #5 from Guille <guille at cal dot berkeley.edu> ---
(In reply to Marc Glisse from comment #4)
> This seems to be already fixed on trunk.
Just tested on most recent gcc version 5.2.1 20151006 (GCC) and it doesn't
compile:
t.c: In function ‘int main()’:
t.c:10:12: error: conversion from ‘B’ to non-scalar type ‘A’ requested
A a = f(B());
^
t.c: In instantiation of ‘auto:1 f(auto:1) [with auto:1 = B]’:
t.c:10:16: required from here
t.c:6:39: error: could not convert ‘A()’ from ‘A’ to ‘B’
static auto f(auto b) -> A { return A(); }
^
